The Principles of Ecology
Across
4. Permanent, close association between two or more organisms of
different species.
9. Organisms, such as fungi, that break down and absorb nutrients
from dead organisms.
11. Interactions among populations in a community; the community's
physical surrounding, or abiotic factors.
14. Organisms that cannot make their own food and must feed on
other organisms for energy and nutrients.
17. Nonliving parts of an organism's environment; temperature, light,
and soil are examples.
19. Role and position a species has in its environment; includes all
biotic and abiotic interactions as an animal meets its need for survival
and production.
Down
1. All living organisms that inhabit an environment.
2. Symbiotic relationship in which one organism benefits at the
expense of the other species.
3. A symbiotic relationship in which both species benefit.
5. Animals that feed on animals that have already died.
6. Simple model that shows how matter and energy move through an
ecosystem; can consist of three steps, but must have no more than
five steps.
7. Organism that used energy from the sun or energy stored in
chemical compounds to manufacture their own nutrients.
8. Model that expresses all the possible feeding relationships at each
trophic level in a community.
10. Symbiotic relationship in which one species benefits and the other
species is neither harmed nor benefited.
12. Group of organsms of one species that interbreed and live in the
same place at the same time.
13. Organism in a food chain that represents a feeding step in the
passage of energy and materials through an ecosystem.
15. Scientific study of interactions among organisms and their
environment.
16. Portion of Earth that supports life; extends from the atmosphere
to the bottom of the oceans.
18. Collection of several interacting populations that inhabit a common
environment.
20. Place where an organism lives out its life.
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